This part of ISO 14951 specifies limits for the composition of oxygen and test methods for verification of oxygen composition. This part of ISO 14951 is applicable to oxygen of the following types and grades, intended for use as an oxidizer and for purging and pressurization of propellant systems of space systems:

• type I: gaseous
  • grade A: standard, purging/pressurization;
  • grade CB: crew breathing;
  • grade F: fuel-cell;
• type II: liquid
  • grade A: oxidizer, 99,6 % pure;
  • grade B: oxidizer, 99,5 % pure;
  • grade F: fuel-cell.

This part of ISO 14951 is applicable to oxygen used in both flight hardware and ground facilities, systems, and equipment. It is applicable to influents only to the extent specified herein.